When asked about the one part of her body she didn't think her husband ever saw, she held nothing back.

"John and I had a double date, and we were joking around, and I go, 'John's never seen my butthole,'" she explains. "And John says, 'Are you kidding? Every time anyone does anything doggy style, you see a butthole. I see it every time.' I was like, 'We are never doing it doggy style again.'"

Leave it to Teigen to say something in public that most people would keep private. And if you think she might learn her lesson for next time, don't bet on it. Teigen says she's always been someone who couldn't help but open her mouth:

"I'm the person who had the fake ID in high school and college, and I would show it and be like, 'I'm sorry; it's fake,' and run off," she recalls. "I don't know if it's way too honest or way too anxious — maybe it's a combo of both."